/*
 * Copyright (C) 2013 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.example.android.bluetoothlegatt;

import android.app.Service;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothGatt;
import android.bluetooth.BluetoothGattCallback;
import android.bluetooth.BluetoothGattCharacteristic;
import android.bluetooth.BluetoothGattDescriptor;
import android.bluetooth.BluetoothGattService;
import android.bluetooth.BluetoothManager;
import android.bluetooth.BluetoothProfile;
import android.content.Context;
import android.content.Intent;
import android.os.Binder;
import android.os.IBinder;
import android.util.Log;

import java.util.Arrays;
import java.util.List;
import java.util.UUID;

/**
 * Service for managing connection and data communication with a GATT server hosted on a
 * given Bluetooth LE device.
 */
public class BluetoothLeService extends Service {
    private final static String TAG = "SYW" + BluetoothLeService.class.getSimpleName();
    private final static String Tag = "SYW" + BluetoothLeService.class.getSimpleName();

    private BluetoothManager mBluetoothManager;
    private BluetoothAdapter mBluetoothAdapter;
    private String mBluetoothDeviceAddress;
    private BluetoothGatt mBluetoothGatt;
    private int mConnectionState = STATE_DISCONNECTED;

    private static final int STATE_DISCONNECTED = 0;
    private static final int STATE_CONNECTING = 1;
    private static final int STATE_CONNECTED = 2;

    public final static String ACTION_GATT_CONNECTED =
            "com.example.bluetooth.le.ACTION_GATT_CONNECTED";
    public final static String ACTION_GATT_DISCONNECTED =
            "com.example.bluetooth.le.ACTION_GATT_DISCONNECTED";
    public final static String ACTION_GATT_SERVICES_DISCOVERED =
            "com.example.bluetooth.le.ACTION_GATT_SERVICES_DISCOVERED";
    public final static String ACTION_DATA_AVAILABLE =
            "com.example.bluetooth.le.ACTION_DATA_AVAILABLE";
    public final static String EXTRA_DATA =
            "com.example.bluetooth.le.EXTRA_DATA";

    public final static UUID UUID_HEART_RATE_MEASUREMENT =
            UUID.fromString(SampleGattAttributes.HEART_RATE_MEASUREMENT);

    // Implements callback methods for GATT events that the app cares about.  For example,
    // connection change and services discovered.
    private final BluetoothGattCallback mGattCallback = new BluetoothGattCallback() {
        @Override
        public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) {
            String intentAction;
            if (newState == BluetoothProfile.STATE_CONNECTED) {
                intentAction = ACTION_GATT_CONNECTED;
                mConnectionState = STATE_CONNECTED;
                broadcastUpdate(intentAction);
                AXLog.e("wzytest", "连接一个GATT服务");
                gatt.discoverServices();
            } else if (newState == BluetoothProfile.STATE_DISCONNECTED) {
                intentAction = ACTION_GATT_DISCONNECTED;
                mConnectionState = STATE_DISCONNECTED;
                Log.i(TAG, "断开蓝牙 Disconnected from GATT server.");
                broadcastUpdate(intentAction);
                AXLog.e("wzytest", "GATT服务中断开连接");
            }
        }

        @Override
        public void onServicesDiscovered(BluetoothGatt gatt, int status) {
            //  发现设备支持的服务列表
            Log.e(TAG, "发现设备支持的服务列表==========  status:" + status);
            if (status == BluetoothGatt.GATT_SUCCESS) {
                AXLog.e("wzytest", "查找GATT服务");


                broadcastUpdate(ACTION_GATT_SERVICES_DISCOVERED);
//                sendSetting();
                //得到两个服务才能发送信息
                cofigDeviceWifi("", "", "");
            } else {
                AXLog.e("wzytest", "查找GATT服务失败");
                Log.w(TAG, "onServicesDiscovered received: " + status);
            }
        }

        @Override
        public void onCharacteristicRead(BluetoothGatt gatt,
                                         BluetoothGattCharacteristic characteristic,
                                         int status) {
            AXLog.e("wzytest", "从服务中接受数据");
            if (status == BluetoothGatt.GATT_SUCCESS) {
                broadcastUpdate(ACTION_DATA_AVAILABLE, characteristic);
            }
        }

        @Override //当向设备Descriptor中写数据时，会回调该函数
        public void onDescriptorWrite(BluetoothGatt gatt, BluetoothGattDescriptor descriptor, int status) {
            AXLog.e("wzytest", "当向设备Descriptor中写数据时，会回调该函数");
            System.out.println("onDescriptorWriteonDescriptorWrite = " + status + ", descriptor =" + descriptor.getUuid().toString());
            Log.e(TAG, "当向设备Descriptor中写数据时，会回调该函数onDescriptorWriteonDescriptorWrite = " + status + ", descriptor =" + descriptor.getUuid().toString());
        }

        @Override//设备发出通知时会调用到该接口
        public void onCharacteristicChanged(BluetoothGatt gatt,
                                            BluetoothGattCharacteristic characteristic) {
            AXLog.e("wzytest", "设备发出通知时会调用到该接口");
            Log.e(TAG, "设备发出通知时会调用到该接口onCharacteristicChanged =======!!!!!! =====characteristic:" + characteristic);
            broadcastUpdate(ACTION_DATA_AVAILABLE, characteristic);
        }

        @Override
        public void onCharacteristicWrite(BluetoothGatt gatt,
                                          BluetoothGattCharacteristic characteristic, int status) {
            super.onCharacteristicWrite(gatt, characteristic, status);

            AXLog.e("wzytest", "设备 发出通知 时会调用到该接口 是否成功:"+status);

            Log.e(TAG, "设备 发出通知 时会调用到该接口 onCharacteristicWrite =======!!!!!! =====characteristic:" + characteristic + "  status：" + status);

            if (status == BluetoothGatt.GATT_SUCCESS) {
                //write成功（发送值成功），可以根据 characteristic.getValue()来判断是哪个值发送成功了，
                // 比如 连接上设备之后你有一大串命令需要下发，你调用多次写命令， 这样你需要判断是不是所有命令都成功了，
                // 因为android不太稳定，有必要来check命令是否成功，否则你会发现你明明调用 写命令，但是设备那边不响应
                AXLog.e("wzytest", "蓝牙发送 成功 getValue: " +  new String(characteristic.getValue()));
            }

        }
    };

    private void broadcastUpdate(final String action) {
        final Intent intent = new Intent(action);
        sendBroadcast(intent);
    }


    public int cofigDeviceWifi(String ssid, String password, String p2ppassword) {

        String testSSID = "{\"wificfg\":{\"op\":\"write\",\"ssid\":\"liuyuyin\",\"psk\":\"liuyuyin2018\",\"p2ppwd\":\"12345678\",\"tmz\":112121}}";
        int len = testSSID.getBytes().length;
        //AXLog.e("wzytest", "testSSID.getBytes():" + testSSID.getBytes() + " length:" + len + " str.len:" + testSSID.length() + " 我:" + "我".getBytes().length +" str："+"str".getBytes().length);
        Write(testSSID.getBytes(), len);
        return 0;
    }


    int Write(byte[] buffer, int lens) {
        int ret = -1;
        int offset = 0;

        do {
            if ((buffer == null) || (lens <= 0)) {
                Log.e(Tag, "buffer is null lens:" + lens);
                break;
            }
            byte i;
            int pkcnt = (lens + 17) / 18;
            byte[] pdata = new byte[20];
            for (i = 0; i < pkcnt; i++) {
                Arrays.fill(pdata, (byte) 0);
                if (lens <= 18) {

                    byte b = (byte)Integer.parseInt("0xff".substring(2), 16);
                    AXLog.e("wzytest","byte b:"+b +" (byte) 0xff:"+(byte) 0xff +" (byte) (-127)"+(byte) (-127));
                    pdata[0] = (byte) (-127);
                } else {
                    pdata[0] = i;
                }
                pdata[1] = (byte) 0xaa;
                if (lens >= 18) {
                    //memcpy(pdata + 2, buffer, 18);
                    System.arraycopy(buffer, offset, pdata, 2, 18);
                } else {
                    System.arraycopy(buffer, offset, pdata, 2, lens);
                    //memcpy(pdata + 2, buffer, lens);
                }
                lens -= 18;
                offset += 18;
                //le_send(pdata,20);
                BleSend(pdata);
                // 发送 20个

            }
            ret = 0;
        } while (false);

        return ret;
    }

   // native void test(byte[] buffer, int lens);

    int BluRecevie(byte[] recevieBuffer) throws InterruptedException {
        int ret = -1;

        do {
            if (recevieBuffer == null) {
                Log.e(Tag, "recevieBuffer is null ");
                break;
            }

            byte[] buffer = new byte[1024];
            byte[] blebuf = new byte[128];

            int pkidx = 0;
            int bufidx = 0;

            while (true) {
                int lret = 0;// blebuf 传递进去
                if (lret <= 0) {
                    Thread.sleep(100);
                    continue;
                }

                if (pkidx == 0) {
                    bufidx = 0;
                }
                System.arraycopy(blebuf, 2, buffer, bufidx, lret - 2);
                bufidx += (lret - 2);
                if (blebuf[1] == 0xaa) {
                    if (pkidx == blebuf[0]) {
                        pkidx++;
                    } else if (blebuf[0] == 0xff) {

                        Log.e(Tag, "===============  bufidx:" + bufidx);
                        pkidx = 0;
                        // 跳出
                        break;
                    } else {
                        pkidx = 0;
                    }
                } else {
                    pkidx = 0;
                }
            }
            ret = 0;
        } while (false);

        return ret;
    }

    /***写操作***/
    void BleSend(byte[] buffer) {

        BluetoothGattService sendService =
                mBluetoothGatt.getService(UUID.fromString(SampleGattAttributes.CLIENT_Service_uuid));

//        BluetoothGattService sendService =
//                mBluetoothGatt.getService(UUID.fromString(SampleGattAttributes.UUID_KEY_Data));

        AXLog.e("wzytest","写入数据sendService:"+sendService);
        if (sendService != null) {
            BluetoothGattCharacteristic sendCharacteristic =
                    sendService.getCharacteristic(UUID.fromString(SampleGattAttributes.CLIENT_Gatt_uuid));
//
//            BluetoothGattCharacteristic sendCharacteristic =
//                    sendService.getCharacteristic(UUID.fromString(SampleGattAttributes.UUID_KEY_Write));

            AXLog.e("wzytest","写入数据sendCharacteristic:"+sendCharacteristic);
            if (sendCharacteristic != null) {
                sendCharacteristic.setValue(buffer);// 固定20个字节
               // writeCharacteristicWrite(sendCharacteristic);//写命令到设备，
                Boolean b = mBluetoothGatt.writeCharacteristic(sendCharacteristic);//写命令到设备，
                AXLog.e("wzytest", "写命令是否成功：" + b);  //如果isBoolean返回的是true则写入成功
            }
        }
    }

    public void writeCharacteristicWrite(BluetoothGattCharacteristic characteristic) {
        if (mBluetoothAdapter == null || mBluetoothGatt == null) {
            AXLog.e("wzytest", "BluetoothAdapter not initialized");
            return;
        }
        AXLog.e("wzytest", "BluetoothAdapter 写入数据");
        boolean isBoolean = false;
        isBoolean = mBluetoothGatt.writeCharacteristic(characteristic);
        AXLog.e("wzytest", "BluetoothAdapter_writeCharacteristic = " + isBoolean);  //如果isBoolean返回的是true则写入成功
    }


    private void broadcastUpdate(final String action,
                                 final BluetoothGattCharacteristic characteristic) {
        final Intent intent = new Intent(action);

        // This is special handling for the Heart Rate Measurement profile.  Data parsing is
        // carried out as per profile specifications:
        // http://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.heart_rate_measurement.xml
        if (UUID_HEART_RATE_MEASUREMENT.equals(characteristic.getUuid())) {
            int flag = characteristic.getProperties();
            int format = -1;
            if ((flag & 0x01) != 0) {
                format = BluetoothGattCharacteristic.FORMAT_UINT16;
                Log.d(TAG, "Heart rate format UINT16.");
            } else {
                format = BluetoothGattCharacteristic.FORMAT_UINT8;
                Log.d(TAG, "Heart rate format UINT8.");
            }
            final int heartRate = characteristic.getIntValue(format, 1);
            Log.d(TAG, String.format("Received heart rate: %d", heartRate));
            intent.putExtra(EXTRA_DATA, String.valueOf(heartRate));
        } else {
            // For all other profiles, writes the data formatted in HEX.
            final byte[] data = characteristic.getValue();
            if (data != null && data.length > 0) {
                final StringBuilder stringBuilder = new StringBuilder(data.length);
                for (byte byteChar : data)
                    stringBuilder.append(String.format("%02X ", byteChar));
                intent.putExtra(EXTRA_DATA, new String(data) + "\n" + stringBuilder.toString());
            }
        }
        sendBroadcast(intent);
    }

    public class LocalBinder extends Binder {
        BluetoothLeService getService() {
            return BluetoothLeService.this;
        }
    }

    @Override
    public IBinder onBind(Intent intent) {
        AXLog.e("wzytest", "绑定蓝牙服务");
        return mBinder;
    }

    @Override
    public boolean onUnbind(Intent intent) {
        // After using a given device, you should make sure that BluetoothGatt.close() is called
        // such that resources are cleaned up properly.  In this particular example, close() is
        // invoked when the UI is disconnected from the Service.
        close();
        AXLog.e("wzytest", "解绑蓝牙服务");
        return super.onUnbind(intent);
    }

    private final IBinder mBinder = new LocalBinder();

    /**
     * Initializes a reference to the local Bluetooth adapter.
     *
     * @return Return true if the initialization is successful.
     */
    public boolean initialize() {
        // For API level 18 and above, get a reference to BluetoothAdapter through
        // BluetoothManager.

        if (mBluetoothManager == null) {
            mBluetoothManager = (BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE);
            if (mBluetoothManager == null) {
                Log.e(TAG, "Unable to initialize BluetoothManager.");
                return false;
            }
        }

        mBluetoothAdapter = mBluetoothManager.getAdapter();
        if (mBluetoothAdapter == null) {
            Log.e(TAG, "Unable to obtain a BluetoothAdapter.");
            return false;
        }

        return true;
    }

    /**
     * Connects to the GATT server hosted on the Bluetooth LE device.
     *
     * @param address The device address of the destination device.
     * @return Return true if the connection is initiated successfully. The connection result
     * is reported asynchronously through the
     * {@code BluetoothGattCallback#onConnectionStateChange(android.bluetooth.BluetoothGatt, int, int)}
     * callback.
     */
    public boolean connect(final String address) {
        AXLog.e("wzytest", "run in method connect");
        Log.e("SYW", "connect: address " + address);
        if (mBluetoothAdapter == null || address == null) {
            Log.w(TAG, "BluetoothAdapter not initialized or unspecified address.");
            return false;
        }

        // Previously connected device.  Try to reconnect.
        if (mBluetoothDeviceAddress != null && address.equals(mBluetoothDeviceAddress)
                && mBluetoothGatt != null) {
            Log.d(TAG, "Trying to use an existing mBluetoothGatt for connection.");
            if (mBluetoothGatt.connect()) {
                mConnectionState = STATE_CONNECTING;
                return true;
            } else {
                return false;
            }
        }

        final BluetoothDevice device = mBluetoothAdapter.getRemoteDevice(address);
        if (device == null) {
            Log.w(TAG, "Device not found.  Unable to connect.");
            return false;
        }
        // We want to directly connect to the device, so we are setting the autoConnect
        // parameter to false.
        // connect device  BluetoothGattCallback  mGattCallback 回调
        mBluetoothGatt = device.connectGatt(this, false, mGattCallback);
        Log.d(TAG, "Trying to create a new connection.");
        mBluetoothDeviceAddress = address;
        mConnectionState = STATE_CONNECTING;
        return true;
    }

    /**
     * Disconnects an existing connection or cancel a pending connection. The disconnection result
     * is reported asynchronously through the
     * {@code BluetoothGattCallback#onConnectionStateChange(android.bluetooth.BluetoothGatt, int, int)}
     * callback.
     */
    public void disconnect() {
        if (mBluetoothAdapter == null || mBluetoothGatt == null) {
            Log.w(TAG, "BluetoothAdapter not initialized");
            return;
        }
        mBluetoothGatt.disconnect();
    }

    /**
     * After using a given BLE device, the app must call this method to ensure resources are
     * released properly.
     */
    public void close() {
        if (mBluetoothGatt == null) {
            return;
        }
        mBluetoothGatt.close();
        mBluetoothGatt = null;
    }

    /**
     * Request a read on a given {@code BluetoothGattCharacteristic}. The read result is reported
     * asynchronously through the {@code BluetoothGattCallback#onCharacteristicRead(android.bluetooth.BluetoothGatt, android.bluetooth.BluetoothGattCharacteristic, int)}
     * callback.
     *
     * @param characteristic The characteristic to read from.
     */
    public void readCharacteristic(BluetoothGattCharacteristic characteristic) {
        if (mBluetoothAdapter == null || mBluetoothGatt == null) {
            Log.w(TAG, "BluetoothAdapter not initialized");
            return;
        }
        mBluetoothGatt.readCharacteristic(characteristic);
    }

    /**
     * Enables or disables notification on a give characteristic.
     *
     * @param characteristic Characteristic to act on.
     * @param enabled        If true, enable notification.  False otherwise.
     */
    public void setCharacteristicNotification(BluetoothGattCharacteristic characteristic,
                                              boolean enabled) {
        if (mBluetoothAdapter == null || mBluetoothGatt == null) {
            Log.w(TAG, "BluetoothAdapter not initialized");
            return;
        }
        mBluetoothGatt.setCharacteristicNotification(characteristic, enabled);

        // This is specific to Heart Rate Measurement.
        if (UUID_HEART_RATE_MEASUREMENT.equals(characteristic.getUuid())) {
            BluetoothGattDescriptor descriptor = characteristic.getDescriptor(
                    UUID.fromString(SampleGattAttributes.CLIENT_CHARACTERISTIC_CONFIG));
            descriptor.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE);
            mBluetoothGatt.writeDescriptor(descriptor);
        }
    }

    /**
     * Retrieves a list of supported GATT services on the connected device. This should be
     * invoked only after {@code BluetoothGatt#discoverServices()} completes successfully.
     *
     * @return A {@code List} of supported services.
     */
    public List<BluetoothGattService> getSupportedGattServices() {
        if (mBluetoothGatt == null) return null;

        return mBluetoothGatt.getServices();
    }
}
